alert http $HOME_NET any -> any any (msg:"ET MALWARE RedExt C2 Agent Register"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/register"; http.request_body; content:"|22|RedExtAgent|22|"; fast_pattern; reference:url,github.com/Darkrain2009/RedExt; classtype:trojan-activity; sid:2062246; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_05_12, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_05_12; target:src_ip;)